When hot(155+ trans temp) under light throttle, my 4l60e has a slow 1-2 shift. Feels closer to stock, but I have a corvette servo and tuner in thee specifically to firm up the shifts It doesn't slip, doesn't flare. All other gears Behave normally. The transmission functions normally whe cold, nice quick shifts. The same if I'm on the throttle to where the trans shifts above 2300rpm. I've verified fluid level and condition. Replaced the trans filter at 115k. Truck has 130k on it now. Couldn't tell you how long the issue has been going on or if it's a new nevelopmemt as I've only recently been driving in stop and go that brings the trans Temps up that high, with driving conditions that allow me to notice it I really don't have any experience with transmission stuff. Where would I even begin to look?